Modeless CDialog and Today CommandBar for WM

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Mobile

I write plug-in for "Today" for WM.
In initialization of my plug-in I create modeless windows - inherited from CDialog

class CMainForm : public CDialog
..........
m_Form = new CMainForm();
m_Form->Create(CMainForm::IDD, Parent);
m_Form->ShowWindow(SW_HIDE);

Depending on certain events I show this window:

m_Form->ShowWindow(SW_SHOW);

Then user press OK/Cancel buttons I hide window:

this->ShowWindow(SW_HIDE);

All work, but after start of my plug-in standard Windows CommandBar hide and it's substituted with the CDialog panel.

How I can return standard Windows CommandBar?